No, it wasn't held legal. You can't play commercial dvds, blurays, etc. on vanilla fedora.

If I remember it correctly, CSS was deemed too weak for being considered copy protection. But I'm far from an expert. I'm not even from the US.

Actually, from skimming the linked white paper: https://www.eff.org/wp/unintended-consequences-16-years-unde...

It looks like there's no way to watch DVDs legally with FOSS (still) in the US?

On the other hand the precedent for ebooks seem a bit better?

https://www.eff.org/es/press/archives/2008/04/21